Briggs Stratton engine 5hp I/C starts ok, runs, but will not rev

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  #1  
Old 03-31-15, 03:25 PM
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Briggs Stratton engine 5hp I/C starts ok, runs, but will not rev

Model 132232, type 0322-01, Pulsa Jet Carb.(Mechanical governor), remote throttle on rotavator.
The engine starts with choke, but will only idle on the fastest ‘Run’ setting and will idle without choke when warm. The throttle shaft on the carb body oscillates on its own, pulsing the revs at idle.
When I spotted this I found that if I operate the throttle spindle manually at the carb body, I can make the engine rev fully and without any misfire or smoke.
The engine stood unused for 3 years and the things tried so far are -
- Checking governor and throttle spring and linkages. Difficult to see, but I think they are all there and connected correctly.
- New spark plug, oil and air filter
- New petrol
- Throttle cable adjusted
- New diaphragm and cleaned accessible passageways with diaphragm cover removed
- Checked choke works as it should with air filter removed
- Removed and cleaned idle needle valve and jet
- Looked at lots of internet posts
This is the Atco Merry Tiller model where the remote throttle connects to the engine below the fuel tank close to where the governor shaft exits the engine.
Rather not strip the carb until all other possibilities explored, particularly as it runs ok when throttle on carb body is turned directly.
Any advice welcome please. Pete (1st post)
 
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  #2  
Old 03-31-15, 06:04 PM
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First thing I would have done if it was unused that long is dumped out old fuel and flushed out the gas tank.
Removed and completly rebuilt the carb and cleaned it with carb. cleaner.
Replaced any filters including the one in the tank if there is one.
Find some place that sells nonethenal fuel, ethenal distroys fuel lines, gums up carb.
At least add an additive that counter acts the effects of ethenal. Any Wal-Mart, auto supply, power tool shop sells it.
 
  #3  
Old 03-31-15, 07:21 PM
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Already flushed out .... why strip it down when it does it run OK when throttle and governor linkages bypassed? Lots of posts from folk who have stripped down and problem persists.
 
  #4  
Old 03-31-15, 08:39 PM
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The carb needs to be cleaned.
 
  #5  
Old 04-01-15, 01:54 PM
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How do you "flush" it out without taking it apart?
 
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